1. The problem statement, all variables and given/known data Four long straight wires located at the corners of a square of side l = 27.8 cm carry equal currents I0 = 16 A perpendicular to the page as shown in the figure above. Determine the magnitude of B at the center of the square. 2. Relevant equations B=mu0/2pi*I/r 3. The attempt at a solution I know that using the equation above I will get the magnetic field. But does it matter that it's asking for the magnetic field at the center? Also when doing the x and y component, I am not sure how to find the angle. Is it just 90 because it's perpendicular?